As I understand from the User Manual, UG uses for gas consumption/mileage a simple calculation MAF * 14.7 when MAF sensor is present.

Otherwise it uses an approximation - a calculation based on MAP sensor, % of load, RPM, typical torque_vs_RPM diagram for atmosphere-charged engines and some adjustment constant VE (I call it a Bulgarian constant

)

I suppose both methods will work very badly with my car. I have a 260hp turbo-charged engine with very flat torque_vs_RPM diagram and use a mix of gas and ethylalcohol (from 3% to 45% of ethylalcohol depending on locally available fuels). As burning 1 liter of ethylalcohol needs 40% less air than burning 1 liter of gas, any calculation based on quantity of air without knowing the percentage of ethylalcohol must be wrong.

The only method which can give accurate results in this situation is the injection-monitoring-based one. My built-in board computer must use this method as it shows reasonable values (103% of real fuel consumption) regardless of fuel mixture composition. Alas, it does not show many other interesting gauges

Am I right?